<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
后台的消息哦 ${msg}
<span th:text="${msg}">span默认文本内容</span><br/>
</body>
</html>